To replace the old refill in your pen, start by carefully unscrewing the pen's barrel to access the empty refills. Gently remove the old refill and dispose of it properly. Next, take the new refill and insert it into the pen, making sure it is securely in place.Always make sure the refill is firmly seated to avoid any interruptions in ink flow. Enjoy the renewed performance of your pen with the fresh refill. Features -Color:Black -Material:Metal -Size:11.60X0.53X0.53cm/4.56X0.21X0.21in -Sturdy metal construction: crafted from sturdy metal, these pen refills offer a and lightweight writing experience that is built to last -Smooth and consistent writing: the quickdrying ink ensures a smooth and consistent writing experience, preventing smudges and blotting -Universal compatibility: these refills are compatible with a wide range of ballpoint pens, making them a versatile choice for any pen collection -Ideal for various settings: practical for use in offices, schools, businesses, and homes, these refills cater to all your writing needs -Convenient for sharing: whether for personal use or sharing with friends and colleagues, these pen refills provide a reliable and convenient writing solution Package list: 3 pcs x 50pcs x ballpoint pen refills